423899923 has 2 divisors, whose sum is σ = 423899924. Its totient is φ = 423899922.

The previous prime is 423899911. The next prime is 423899999. The reversal of 423899923 is 329998324.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423899923 is a prime.

It is a super-2 number, since 2×423899923² = 359382289438811858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (423899023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211949961 + 211949962.

It is an arithmetic number, because the mean of its divisors is an integer number (211949962).

Almost surely, 2^423899923 is an apocalyptic number.

423899923 is a deficient number, since it is larger than the sum of its proper divisors (1).

423899923 is an equidigital number, since it uses as much as digits as its factorization.

423899923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 49.

The square root of 423899923 is about 20588.8300541823. The cubic root of 423899923 is about 751.1980396195.

The spelling of 423899923 in words is "four hundred twenty-three million, eight hundred ninety-nine thousand, nine hundred twenty-three".